Boring-tool



W. C. MEREDITH AND W. C. WILLIS.

BORING TOOL.

' APPLICATION FILED DEc.I9, 1916.

. .v 21 I I Z5 WflMredz'i/t, I I

Patentedsept. 14,- 1920. I

snare STATES WILLIA C. MEREDITH AND WILLIA 0. wings, on ATLANTA, GEORGIAQASSIGNORS I or ONE-THIRD To; a. H. WHITE, o ATLANT-A, GEORGIA. Y

' BORING-TOOL.

. ,Specification of LettersPatent. Pgatgnted Septl i, 1?:920.

Application filed December 19, 1916. "Serial No. 137,798. F

To all whom it may concern Be 11; known that we, WILLIAM such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in boring and drilling tools for drilling wooden pipes, conduits and the like; and an object of the invention is the provision of a tool of this type that will drill a smooth and straight bore, and including a novel type of cutter head having a passage therein through which the" shavings and the like,

will be conveyed through the head and discharged at the rearend thereof. Another object of he'invention is the provision of a tool of this character having a novel type of removable cutting bit-that can be conveniently associated with the head and removed therefrom, expeditiously, and of such configuration that they will cut an even and straight bore.

Other objects will appear-and be better understood from that embodiment of our invention of which the following isfla specification, reference being had to the accompanying drawingsforming a part thereof, inwhich:

Figure 1 is a perspective view of a cutter head constructed in accordance with our invention and having associated therewith the improved cutting bit, V

Fig. 2 is a vertical sectional view, taken on the line 22 of Fig. 1,

Fig. 3 is a horizontal sectional view, on the line 3-3 of Fig. 1, n

Fig. 4 is detail perspective view of a modified form of cutter head and bit.

Fig. 5 is a detail section view taken on the line 5-5 of Fig. 4.

Referring to the drawings in detail, and

particularly to Figs. 1, 2 and 3, the cutter head is designated by the numeral 1 and is of cylindrical shape, having a bore 2 therein. The head l is provided, at one end thereof, and at diametrically opposite points with cutout portions 3, through which the shaving, and the like, can enter the head C. MERE- I nrrrr and WILLIAM C. WILLIS, citizens of the.

taken andbe received by'thebore 2, so that the shavln'gs can be conveyed. tothe opposite ation. The head 1*is also provided, at diametrically opposite points, with elongated grooves 4 that are ofdovetail shape in cross section, as shown in Fig. 3 of the drawings. The grooves 4 are locatedadjacent the re-. 'spective cutout portions 3 but are of lengths exceeding the lengthioi the'cutout portions 3, as shown in Fig. 1' of the drawings. Bemovably associated with the head 1 is a pair shoulder 6, which overliesa shoulder 6" formed on the adjacent wall of the dovetail slot 4, so as to limitfthe inward-movement of the shank 5. The upper ends'of the shanks 5 areprovided with heads '7, each o'f which is of substantially rectangular shape in configuration, as shown'in Fig. 1 of the drawings. The heads 7 overlie the bore 2 in the cutter head l and are also slightly.

directed inwardly, as shown. in- Fig. 2 of the drawings, and each head 7'has one, edge thereof formed to provide a cutting edge 8.,

The heads 7 are so arranged with-respect to each other that the inner end of the'cutting edge on one head opposes the inner end of thefcutting' edge Son the other head and. the saidcutting edges lie, respe c'tively,latobtuse anglesto each other. -The" angular arrangement of the cutting edges 8 will effeet a straight andeven bore to be cut throughout-the length of the work. The sl'iavingsland' such material cut from the work, during the drilling operation, will passthroughthe bore and be discharged therefrom at the upper end ofthe head.

In the constructionshown in" Fig. 4 the cutting head designated 9 has a longitudinally extending bore 10 therein similar to the bore 21in the head 1, and one end of the head 9 is provided with a pair of slots 11,, which are ofiset from each other and each has one end opening into one side'of the "head 9 and the other end communicating end of the head, during the drilling operof cutting bits, each of which'includes a ,1

' With the bore in the head 9, and each slot has one wall thereof undercut, as shown at A pair of cutting bits 13 is remov ably associated with the head 9 and-the said cutting bits are arranged in offset relation With respect to each other and are received by recesses 1-1, formed in advance of the undercut portions 12. The recesses 14: areinclined throughout their width at an angle to the transverse axis oi the head 9 and are also inclined inwardly [throughout :their length at an angle to the longitudinaljaxis of the head 9. The cutting bits 13 are each of rectangular shape and by virtue oi". the inclination of the recesses 'l-i thatreceive the cutting bits 11, the, said cutting bits Willbe disposed at an incline both to the transverse axes and longitudinal axes otthe heads 9.xEach cutting bit has one of the longitudinal sides thereof disposed 0ppo-.

site one or the slots 11 and beveled to. provide a cutting edge 15. The terminal of that end of the head 9 that has the cutting bits 13 associated therewith is dished, as shoi'vn inv Fig. i, and: by virtue of the inclination the cutting bits 13 the outer end ting edges l5 will be disposed beyond the plane ofthe adjacent terminal of the heads 9 and the inner ends of the cutting edges 15 will be disposed within the plane of the T1611. minal of the adjacent'end of the head 9.

Y The slots 11 and the undercut portions 12 admit ,of shavings and like material that have been cut from the work, during the drilling OPBI'ELtlOIl, entering the bore 10 in the head 9 and being discharged through the rear end offthebore 10;

. It is evident thatvarious changes'niight be resorted to in the construction,v

invention as claimed.

What We claim is: p 1. A boring tool comprising a cylindrical head havinga bore, and a pair of bits i'einovably secured-t0 said head anddisposed over one end of the bore and arranged in offset relation with respect to each other, said bits being inclined both to the transverse axis and longitudinal axis of said head'and each 1S 0 L bilG (1th".

longitudinally of the head.

rm and arrangement of the several parts without departing from the spirit and scope'of the;

having one longitudinal side thereof beveled to provide cutting edges so that the inner end of one cutting edgeopposes the inner end of the other-cuttingedge and at obtuse angles to each other, said head having 0pranged adjacent the outer ends of thebits.

'positelydisposed cut-out portions and ar- 2. A boring tool including ahead having a bore, said head having at diametrically opposite points cut-out portions and elongated slots adjacent thereto and said slots bein of dove-tail sha 3e in cross section a shanksioi dove-tail construction fitted. 1111 said slots,a shoulder formed on one wall ofeach slot, shoulders termed on the shankseand engagingthe firstnained shoulders to limit the movement of the shanl'zs in -said:slets,

and cutting heads formed on said shanks and overlying the bore and directed inwardly and having one edge sharpened t O'fOl'ID cut;

tingedges arranged at .obtuse angles to each other, with the inner end of one cutting edge. opposing-the innerend ofthe other-cutting I edge. r 3; A boringtool. comprising a hollow head,

and a pair of cutting bits located; at theifora ward end of the head. and extending respectively in opposite directions at a :i'orward and lateral. inclination from {a point located, centrally of and within the plane of the-tor Ward endofthe head to its lateral wall, the

respective bit, being also arranged- 01124019190" site sides of a plane extending centrally: and

v 1;. A boring tool. comprisinga headhaving; a bore and oppositely d sposed recesses in communication with said-bore, shanks Se cured to the head, substantially rectangular shaped'cuttingbits formed on the shanks and overlying the .bore andextend ng in opposite directions and beveled to provide cut-u whereof we .aifin our sigi-iag 

